题文
—Sam，come downstairs，please．I need your help．
—Sorry，Mum．I________on the phone．
| A．am talking |
| B．talked |
| C．was talking |
| D．have talked |
—Sam，come downstairs，please．I need your help．
—Sorry，Mum．I________on the phone．
| A．am talking |
| B．talked |
| C．was talking |
| D．have talked |
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